Drum muffler



March 7, 1950 B. E. WALBERG DRUM MUFFLER Filed Feb. 20, 1946 PatentedMar. 7, 1950 UNITED STATES PATENT OFFICE DRUM MUFFLER Bernard E.Walberg, Worcester, Mass.

Application February 20, 1946, Serial No. 649,079

2 Claims. (01. 84411) This invention relates to new and improved drummuflling devices for the purpose of controlling vibration and tone ofdrums and the like.

Objects of the invention include the provision of a device disposablebetween the drum heads interiorly of the drum and secured to the shellfor adjustment of mufflers contacting both drum heads for simultaneousand equal control of vibration and tone of both drum heads.

Other objects and advantages of the invention will appear hereinafter.

Reference is to be had to the accompanying drawings, in which Fig. 1 isa view in elevation of the novel drum mufller showing the same attachedto a drum, parts being in section; and

Fig. 2 is a view in side elevation of the device of Fig. 1, parts beingbroken away.

In the drawing there is shown a drum having a shell I and a pair of drumheads l2 attached thereto in the usual manner. A spring bar I4 issecured transversely of the shell by means of fasteners 56 having headsl8 finding bearing points on a plate 20 at the exterior of the shellIll. The bar i4 is considerably longer than the height of the shell orthe width of the drum and is provided with arms 22 and 24 bentdownwardly as shown in Fig. 1, to coincide in general with the drumheads.

The arms 22 and 24 are pivotally secured to links 20 at 28 by means ofbrackets 30, and are also secured to cross rods 32 by any desired meanssuch as rivets. The rods 32 are disposed transversely of the arms 22 and24 and parallel to the drum heads. Muffling pads of felt or othermuilling material are shown at 34 and are secured to the ends of rods 32at the outside aspects thereof to contact the drum heads and muffle thesame.

Links 26 are pivoted at 36 to a drilled and tapped block 38 receiving ascrew threaded rod 40. The screw threaded rod 40 is connected by aspindle 42 to a finger grip 44 located at the exterior of the shell iiiand a collar or the like 46 is provided on the spindle to maintain rod42 in its axial position relative to the shell.

As finger grip 44 is turned in one direction. block 38 will traveldownwardly to swing arms 22 and 24 and therefore the mufflers 34inwardly toward each other thus lessening the muiliing effeet; on theother hand finger grin 44 may turned o positely to raise block 38.thrusting arms 22 and 24 and. therefore, mufflers 34 outwardly away fromeach other thus increasing the tension 2 on the drum heads. It will beseen that this invention provides a simple, easily operated andadjustable drum muffler for muffling both drum heads simultaneously, andthe entire device is concealed within the drum except for the adjustingfinger grip 44.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claims, but what I claim is:

1. A drum muffler comprising a spring bar, end portions thereof formingswingable arms, means to secure the spring bar to a drum shell, 2.block, links connected to said end portions and to the block, means tomove the block toward and from the spring bar to adjust the end portionstoward and from each other, drum head pads, and means securing thelatter to the end portions for selectively greater or lesser muiilingcontact with the drum heads.

2. The combination of a drum having a shell and a pair of spaced drumheads with a drum muffler therefor, the latter comprising a pair ofmovable arms, means to mount the arms within the drum, means to move thearms selectively or from each other to move the same from or toward thedrum heads respectively, a drum head muffiing pad for each arm, meanssecuring a pad to each arm, means exterior of the drum for operating thearm moving means, the latter comprising a pair of links, means pivotingeach link to an arm, means to pivot the arms, the last named means beingoperative by the means exterior of the drum.

BERNARD E. WALBERG.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 573,320 Boulanger Dec. 15, 1896622,128 Day Mar 28, 1899 663,853 Boulanger Dec. 18, 1900 725,842 HennlApr. 2-1, 1903 815,907 Davis Mar. 20, 1906 FOREIGN PATENTS NumberCountry Date 54,405 Austria July 25, 1912 190,007 Germany Dec. 5, 1906342,951 Germany Jan. 1, 1921

